<span>Homologous chromosomes exchange DNA during meiosis in a process called crossing-over. Crossing-over sometimes involves an unequal swapping of DNA. Basically one chromosome in the pair gets extra DNA.</span>
Answer:
Earth is one of the eight planets of our planetary group that rotates around the sun.
Earth is the main known planet that upholds life in the whole planetary group.
World Earth Day is commended on the 22nd of April consistently. It is to increment public attention to the Earth's economical climate.
World Earth Day features the significance of ecological assurance for the endurance of life.
It is accepted that the Earth should be 4.5 billion years of age.
Right around 70% of the outer layer of the Earth is covered with water. Thus, it is known as a blue planet and an extraordinary planet.
Earth has an air holding back 20% of the oxygen that aides in the endurance of living creatures.
Gases like oxygen, carbon dioxide, and nitrogen in the Earth's environment assist plants with developing.
Earth is spheroid in shape. It is critical contrasted with different planets like Mercury, Mars, Neptune, Pluto, and Venus.
Earth finishes its circle around the sun in 365 days. In such a manner, it makes a jump year once in four years.
Answer: Their potential to regenerate and repair damaged tissue.
Answer:
The placenta is the temporary association of fetus and maternal tissue. It is meant for nutrition and transport of different substances.
Explanation:
The placenta is a temporary association of fetal and maternal tissues. The placenta is formed from the trophoblast of the blastula. These trophoblasts form chorionic villi which later forms the placenta. The chorion and allantois also take part in the formation of the placenta. Hence, the human placenta is known as the chorioallantoic placenta. The process of formation of the placenta is known as placentation.
The placenta has several functions but the major function is to provide nutrition to the fetus. The developing fetus gets nutrition from the mother's body by the placenta. The placenta provided with blood vessels which help in the transportation of different substances. It also helps in gas exchange between the mother and baby. Thus it plays a vital role in fetal respiration. The metabolic wastes diffuse through the placenta. Placenta also stores fat, glycogen, which participates in protein metabolism.
